In the process of circuit board layout, it is necessary to consider that any current carrying power track may generate unwanted magnetic coupling when opening and closing normal loads. Due to the correlation between magnetic coupling and current, the above phenomenon may be significantly higher in the event of overload or short circuit compared to normal load.Key points for using SSPCOne important point is to prevent any oscillation on the low-power side control signal as much as possible. SSPC provides an internal limit of short-circuit surge current at the nominal value of 40 amperes. The practice of good layout for high current track wiring must be kept as far away as possible from the control signal track, which has always been a symbolic consideration to prevent such troubles.

Capacitive load capacity

The regional SSPC can be turned on at 1500uF for a nominal pure capacitive load of 48V or 2200uF@24 The voltage did not decrease. When SSPC is already in the connected state and a non charged capacitive load is applied, that is. By manually switching, the power switch can also trip when the capacitance is less than 80uF. If high, it is recommended to use a capacitive load to verify whether the load charging current intersects with the SSPC I ² t curve to prevent accidental tripping. Overloading of capacitors will not cause permanent damage to SSPC devices.

Sensory load capacity

The regional SSPC is equipped with internal free wheel power diodes between the load and PWRGND to provide a simple discharge path for the energy stored in the induction line in the event of power failure or tripping. This diode can prevent any unnecessary negative voltage transients between the load and the line pins, which may exceed the absolute rated value of 400Vdc, improving the reliability of the equipment. When driving induction lines or long lines, it is recommended to use an external rated transient suppressor between the line and the PWRGND pin to prevent any possible issues. Inductive overload can affect SSPC devices. Due to various technical reasons, the use of SSPC devices does not allow direct parallel connection to increase load current performance. Manufacturers suggest avoiding such use as much as possible.

Heat sink design

The regional SSPC is equipped with an internal 95 ° C over temperature detection circuit that automatically shuts off. The power switch is used when the shell temperature exceeds this limit. The formula for the maximum ambient temperature without the need for a radiator is: 95 ° C - (7 [° C/W] x (0,26 [ohm] x I load ² [Amp]). Working environment temperatures exceeding this limit require external carriers and forced radiators. This can be locked onto the device housing using two M3 screws to secure the external bracket.